The UMD is dead
One of the biggest announcements at the Tokyo Game Show was that Sony plans to make all new PSP game releases available simultaneously on the usual UMD discs and as digital downloads.
Naturally this is only in Japan at first, but from October 15 they'll be able to download games such as LocoRoco 2 and Patpon 2 directly to their PSP.
There doesn't seem any chance the same scheme will start here until next year.